From IMSA To Japan: A Cunningham Racing V8 300ZX – Speedhunters


I only bring this up today because I can’t help but think of that car every time I see a 300ZX. Even if the 300ZX in question happens to be a genuine race car that was part of the same successful Exxon team Steve Millen belonged to.


Steve is of course brother to Pike’s Peak legend Rod and uncle to drift legend Rhys, and like his Millen family members was an absolute weapon on track, especially when behind the wheel of a race car like this one.

75 Is Alive


Steve drove 300ZX-skinned cars alongside teammate John Morton as part of Clayton Cunningham Racing. From 1989 to 1995, seven chassis campaigned IMSA under the numbers #75 and #76, each powered by a 3.0-liter twin-turbo V6.

These engines, which featured an aluminum block, Garrett turbochargers, carbon fibre intakes and a rather large intercooler, were descendants of the motors used in Nissan’s GTP cars of the time. Restricted, they put down 650 to 750hp depending on the configuration of the day. What they were capable of sending to the tires unrestricted is at this point unknown, but it’s rumoured to be a number four figures deep.

On the track, the 300ZXs did exactly what they were designed to do: win. Steve and John won at Le Mans, Daytona and Sebring.

While considerably wider than the production Z32, the carbon fibre bodies these cars ran with definitely carried forward much of the “good design” that Sara lovingly acknowledged in her recent 300ZX story.


Noteworthy accomplishments for the 300ZX IMSA program at that time included wins at Watkins Glen and Road Atlanta, as well as several pole positions and two fastest laps.

Under the red, white and blue skin exists a remarkable chassis designed by former Nissan chief designer Trevor Harris. Prior to working with the Z32 chassis, Harris spent considerable time making Datsun 510s incredibly competitive. He did this when America still didn’t really acknowledge the potential of silly little cars from Japan.


Because the GTO (and then GTS) class didn’t require factory underpinnings, a tube chassis was designed from the ground up. The wheelbase of this car is 96-inches long, which is slightly longer than the short-wheelbase version of the production Z32.


When designing a chassis, Trevor specifically intends for them to have minimal body roll, so this car features rather large sway bars and as low a spring rate as he could reasonably get away with. The rear sway bar stiffness can be adjusted by the driver from within the cabin; everything else needs to be tweaked by the pit crew.


In standard IMSA form, the car is designed to run on 18-inch wheels that can wear 25.5-inch rubber in the front and 28.5-inch rubber in the rear. Braking comes via water-cooled Cunningham calipers and NPTI discs.


The ‘300ZX-GTS’ in these photos, chassis #009, is a little different than some of the earlier cars. For a start, it’s not twin-turbo V6-powered. Instead, a Nissan VH-series V8 can be found ahead of the quick-change rear end.

Whether it was a spare car or a development car is where things get a little bit murky, but it’s one of only two cars built by Cunningham Racing originally configured for use with the V8 engine, not retrofitted afterwards as other cars were. This would have allowed it to race in the 1995 IMSA GTS-1 class (the VG engine was outlawed at the end of the ’94 season), but the car was reportedly sold to Japan before it competed in any US events.


Records of the time are not the most precise for the vehicles later down the line, and because this car was crashed in Japan and later repaired, it could contain parts from a variety of different chassis. Regardless of its specific provenance though, it’s a 300ZX worthy of discussion. Not simply because it still exists, but because it’s still being run.

Be About It


Since taking ownership in 2014, Jun Hosoi from PEAK’S, a company that produces carbon fiber components for mostly motorsport applications, has been both driving the car and trying to accurately compile its lost history.


In 1997, it had been entered in a couple of JGTC GT500 class races wearing Fedex logos, but did not enjoy any success. Today, in its restored condition, it features the iconic Cunningham Racing 12 Hours of Sebring-winning livery.


When he’s out on track, Hosoi-san is not going at the same speeds the 300ZX-GTSs ran in their heyday, but the car is still being driven often and as hard as possible for a precious 25-plus-year-old race chassis.


The Nissan often appears alongside Hosoi-san’s NASCAR Toyota Camry and Mosler MT900R, and the ‘Nerds’, a group of like-minded driving enthusiasts, share driving duties every now and then.

When Mark caught up with the Nissan, it was at PowerCraft Japan surrounded by several ridiculous cars including a genuine Shelby Cobra and an ex-Le Mans Mazda 254i. Like the 300ZX, these cars are also prepared to be driven.


Unfortunately, while Mark was able to shoot the car sitting still, he wasn’t able to capture it trackside. At least not yet… Still, we’re Speedhunters, and passing up the opportunity to photograph and write about this car – even stationary – is something we couldn’t do.

Dave Thomas 
Instagram: stanceiseverythingcom

Photos by Mark Riccioni
Instagram: mark_scenemediaTwitter: markriccionimark@speedhunters.com

IMSA related stories on Speedhunters